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Sticky Bolt on 7mm mag

 
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  #1  
Old 03-17-2011, 05:59 PM
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Sticky Bolt on 7mm mag

I decided to try a different load for my 7mm rem mag with 68gr of Retumbo and the Berger 180 Hybrids. Velocity was good averaged around 2980~ with ES around 25 with the exception of one low and one high round. Accuracy was really good at 850yds, probably the best I've had, but on about 5 rounds out of the 20 the bolt wouldn't open easy. It would "rise" as easy as it ever has, but wouldn't slide open easily on the 5 rounds. It didn't take much at all to get it open, but definatly a little sticky. I didn't recognize any other pressure signs but I typically don't press the envelope to much. The nearly 3000fps with a .674bc bullet is very appealling, but I don't want to risk anything that could be dangerous.

I guess I'm just looking for opinions on what my next step should be. I was thinking about just dropping down .3 to .5 grains and not worrying about it.
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Old 03-17-2011, 07:21 PM
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Re: Sticky Bolt on 7mm mag

check the lenght of your brass, if OK, then drop down .2 grs and try again. If it's pressure your not high by much. I would go down .2 grs at a time. If the bullet is against or close to the rifling back it out a little. Berger bullets like a jump to the rifling, .020 to .080 off the lands isn't uncommon and they shoot best for me around .050 to .060 off the lands and I can now add more powder for more FPS.
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Old 03-17-2011, 08:32 PM
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Re: Sticky Bolt on 7mm mag

Quote:
Originally Posted by mountainman View Post
check the lenght of your brass, if OK, then drop down .2 grs and try again. If it's pressure your not high by much. I would go down .2 grs at a time. If the bullet is against or close to the rifling back it out a little. Berger bullets like a jump to the rifling, .020 to .080 off the lands isn't uncommon and they shoot best for me around .050 to .060 off the lands and I can now add more powder for more FPS.
Thanks for the reply. Brass was all trimmed to 2.490 and the bullets are seated .020 off the rifling. I'll probably give it another go with a slightly lower amount as you suggest.
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Old 03-17-2011, 08:52 PM
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Re: Sticky Bolt on 7mm mag

Quote:
Originally Posted by jsimonh View Post
I guess I'm just looking for opinions on what my next step should be. I was thinking about just dropping down .3 to .5 grains and not worrying about it.
Question for you - are you FL resizing and moving the shoulder back at all?? Any idea how many times brass has been fired totally? And last question is - did you notice any resistance when you were chambering a round?

If none of the other suggestions fit - your easiest solution to try is to reduce powder as suggested but summer is coming and so is the heat and you may/maynot be right back to the same problem later on.

I shot a belted 7mm rem mag for years and ran into the same problem after using brass beyond 4-5 times even with FL resizing.

If your brass has had a number of uses you might want to take a look at Larry Willis' belted mag collet die and see if the explanation fits into what you are running into. Innovative Technologies - Reloading Equipment

Good luck------
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  #5  
Old 03-27-2011, 08:32 PM
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Re: Sticky Bolt on 7mm mag

I shot 30 rounds today loaded with 67gr of Retumbo. I had about 5 stick pretty bad, so we got to tinkering and noticed that some of the loaded unfired cases would stick pretty bad if I chambered them and then immediatly tried to extract them.

This is new Win brass trimed to 2.490 and sized in a Redding Body die and Lee Collet Neck die.

I'm not sure why it would go in easy then extract hard with it being unfired, but thats what it was doing.

Any ideas?
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  #6  
Old 03-28-2011, 09:09 PM
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Join Date: Nov 2010
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Re: Sticky Bolt on 7mm mag

My 6.5 X 284 does the same thing with soft Lapua brass. Switch to Win brass
(same capacity) and bolt is fine. Soft brass will some times show those symptoms.
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  #7  
Old 03-31-2011, 03:08 PM
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Re: Sticky Bolt on 7mm mag

Try bumping the shoulder back some with a FL die.
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